Important It is possible that the main title of the report Atrioventricular Septal Defect is not the name you expected. Please check the synonyms listing to find the alternate name(s) and disorder subdivision(s) covered by this report.
Atrioventricular Canal Defects
Common Atrioventricular Canal (CAVC) Defect
Endocardial Cushion Defects
Complete Atrioventricular Septal Defect
Transitional Atrioventricular Septal Defect
Incomplete Atrioventricular Septal Defect
Partial Atrioventricular Septal Defect
Atrioventricular septal defect (ASVD) is a general term for a group of rare heart defects that are present at birth (congenital). Infants with ASVDs have improperly developed atrial and ventricular septa and adjoining valves.
The normal heart has four chambers. The two upper chambers, known as atria, are separated from each other by a fibrous partition called the atrial septum. The two lower chambers, known as ventricles, are separated from each other by the ventricular septum. Valves (e.g., mitral and tricuspid) connect the atria (left and right) to their respective ventricles. The valves allow for blood to be pumped through the chambers. Blood travels from the right ventricle through the pulmonary artery to the lungs where it receives oxygen. The blood returns to the heart through pulmonary veins and enters the left ventricle. The left ventricle sends the now oxygen-filled blood into the main artery of the body (aorta). The aorta sends the blood throughout the body.
The parts of the heart described above are formed from an embryonic structure called the endocardial cushions. In individuals with ASVD there is some combination of malformation of these parts of the heart. They may include a hole in the atrial septum, a hole in the ventricular septum, and/or abnormalities of the mitral and triscupid valves. ASVD may be classified as one of three forms: an incomplete (or partial) ASVD (atrial septal defect primum); a transitional form (atrial septal defect and small ventricular septal defect); or a more severe or complete form (large atrial and ventricular defects).
The symptoms of ASVD vary greatly and depend on the severity of the malformations (e.g., valve leakage between ventricles and ventricular size). About half the cases of ASVD occur in children with Down syndrome.
American Heart Association 7272 Greenville Avenue Dallas, TX 75231 Tel: (214)784-7212 Fax: (214)784-1307 Tel: (800)242-8721 Email: Review.email@example.com Internet: http://www.heart.org
American Lung Association 1301 Pennsylvania Ave NW Suite 800 Washington, DC 20004 USA Tel: (202)785-3355 Fax: (202)452-1805 Tel: (800)586-4872 Email: firstname.lastname@example.org Internet: http://www.lungusa.org
NIH/National Heart, Lung and Blood Institute P.O. Box 30105 Bethesda, MD 20892-0105 Tel: (301)592-8573 Fax: (301)251-1223 Email: email@example.com Internet: http://www.nhlbi.nih.gov/
Kids With Heart ~ National Association for Children's Heart Disorders, Inc. 1578 Careful Dr. Green Bay, WI 54304 Tel: (920)498-0058 Fax: (920)498-0058 Tel: (800)538-5390 Email: firstname.lastname@example.org Internet: http://www.kidswithheart.org
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Congenital Heart Information Network (C.H.I.N.) P.O. Box 3397 Margate City, NJ 08402-0397 Tel: (609)823-4507 Fax: (609)822-1574 Email: firstname.lastname@example.org Internet: http://www.tchin.org
Genetic and Rare Diseases (GARD) Information Center PO Box 8126 Gaithersburg, MD 20898-8126 Tel: (301)251-4925 Fax: (301)251-4911 Tel: (888)205-2311 TDD: (888)205-3223 Internet: http://rarediseases.info.nih.gov/GARD/
For a Complete Report
This is an abstract of a report from the National Organization for Rare Disorders (NORD). A copy of the complete report can be downloaded free from the NORD website for registered users. The complete report contains additional information including symptoms, causes, affected population, related disorders, standard and investigational therapies (if available), and references from medical literature. For a full-text version of this topic, go to www.rarediseases.org and click on Rare Disease Database under "Rare Disease Information".
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It is possible that the title of this topic is not the name you selected. Please check the Synonyms listing to find the alternate name(s) and Disorder Subdivision(s) covered by this report
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Last Updated: 2/11/2008 Copyright 1986, 1994, 2005 National Organization for Rare Disorders, Inc.
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